Heat-control regulator and attachment device



Qct. 8, 1929. 5, TAYLOR 1,731,068

HEAT CONTROL REGULATOR AND ATTACHMENT DEVICE Filed June 14', 1928 Z9 J0In 26 '1. 30 30 ,3 I 4/ 3 v J 3 t g I a 4 "km." ,3 27* 4 $5 37 Q HmATTORNEYS.

Pam oes, 1929- sanroan matron, of ommsms,

PENNSYLVANIA, ASSIGN OB TO ELI'XTBIC APPLIANCE column, 01' PHILADELPHIA,PENNSYLVANIA, A OOBPORATIOH OI PENNSYLVANIA mar-common mum'r'oa m a'rracfinm'rr mzvrcn Application maeu; ma. Serial my 2mm.

My invention relates to a novel construction of a thermostatic heatcontrol attachment device which is ada ted to be attached to an electricpercolator, at iron, waflle iron,

5 or any other electrical heating appliances, whereby a novel heatcontrol and regulation is readily and instantaneously attained by therotation or adjustment of a rotatable disc positioned in substantiallythe longitudinal median line of the attachment housing in such a waythat its periphery protrudes from the top and bottom thereof, so as tobe readily manipulated, said disc having an eccentric groove rovidedwith a locking recess cut in a wallor acethereof and provided withindicia or graduations on its periphery graduated to the number ofdegrees Fahrenheit which theoperator wishes the heating applianeeto re-My invention further consists of a plurality of contact points, one ofwhich is carried by the thermostatic element of novel construction andis juxtaposed to an upper contact point which is carried by a contactmem ber actuated by the eccentric groove of said rotary disc, saidcontact points bein made from a non-magnetic nonfusib e Ina-- terial. rv a My invention further consists ofa novel construction of a sectionalhousing having a centrally di osed transverse recess in said housing memrs and a bearin in which is seated the hub of the rotatable having inits 0 posite wall an eccentric groove, and aloe grece ss, saidrotatabledisc axiall revoluble on about the longitu merhan line of thehousing, so that all the parts have a symmetrical, well balanced, and spleasin appearance, and said disc is readilly manip ated bya thumb andfinger of the operator.

To the g P of a novel construction 0 a thermostatic heat controlattachment device, composed of two housing'sections within which iscontained and mounted the centrall disposed rotatable adjusting in 'ciaon itsouter pecentric groove and a l above ends, -m invention consistsriphery, said disc being provided with anecan ofiset member carrying acontact point,

which is juxtaposed in proximity to a contact point carried b thethermostatic ele-' ment. which is in electrical contact at all timeswith one of the contact clips.

. My invention consists in providing a notch or locking recess in saideccentric groove,

' registering with the oil? position of the rotary adjusting disc to ardagainst the ac cidental turning on of e current.

'My invention further consists of 'novel means engaging the knurled rimoi said adusting disc to prevent the backward turning or slipping ofsaid disc, and to lock the latter in any position in which it is set,and in a novel manner of mountingthe thermoto static element and itsadjuncts.-

' It further consists of other novel features of construction andadvantage,all as will be hereinafter pointed outein the specificationand claims appended hereto.

v For the purpose of illustrating my invention I have shown in theaccompanying drawings one form thereof which is at resent pre-' ferredby me, since the same has lieen found in practice to give satisfactoryandreliable results, although it is to be understood that the variousinstrumentalities of which my invention consists can be variouslyarranged and organized and that my invention is not limited to theprecise arrangement and organization of the instrumentalities as hereinshown and described.

Figure 1 represents a-perspective-view of a. thermostatic heat controlattachment device embodying my invention.

Figure 2 represents a plan view of the bottom member of said device withthe cover and internal structure removed, I

Figure 3 represents a lan view of the top membefof the device wit thecover and inter- 9'0" nal structure removed.

I Figure 4 represents a plan view of the bottom member of the devicewith cover removed and showing the internal structure. Y 5 represents asection on line 5-5 05 igure 6 a section on line 6-6 are Trepresents agrspective'view of therotary adjusting disc own'detached. V

Figure 8 represents a front view of Figure 7.

ing, its outer periphery beingsubstantially flush with the top andbottom bosses 5 and 6, as will be seen from-Figures 1 and 5, whereby anenlarged chamber is formed within said hoses and a neat-and finishedappearance is given to the device. The disc 4 is provided with thecentrally disposed hub 7 which has its bearing in the recesses 8 formedin the corresponding portions of cap and bottommembers2 and 3, as willbe understood from Figures 2 and 3. On the face of the rotary disc 4opposite the hub 7 is'formed a groove 9 which is eccentric to said huband to the axis of rotation of said disc, and in said groove 9 ispositioned the lateral extension 10 of the curved spring arm 11, whoselower-end is outwardly deflected as indicated at 12 and secured to thelower member 3by one of the screws 13, as will be understood from Figure6. The lateral extension 10 c arries the contact '14 which isjuxtaposedi or in vertical. alignment with the upper contact point 15carried on the top of the lower thermostatic element 16, which may beany thermostatic element sensitive, to

V 'or affected by variations of temperature, said thermostatic arm 16being in contact with and secured to a lower complementary contact arm17, bythe screw 18 passing therethrough and threaded-in the metalliceyelet 19 embedded in the lower-housing member 3, as will be bestunderstood from Figures 4 and 5', said complementary contact arm 17being suitably deflected to fit over the boss20. The

' contact arm 17 is provided with the lateral integral extension 22, seeFig.9, which is defiected as at 23to fit over the boss 24 to which it issecuredby the screw 25 passing through the eye 26 and threaded intothelower housing member 3, as will be understood from Figures 4 and 9. 1

The upper and lower housing members 2 and 3 are provided with the rearopenings 27 for the admission of the electrical conductor 27, whichopenings merge into diverging grooves or channels 28 for the receptionof the bared ends (not shown) of said electrical conductor 27, to befastened by the binding screws 13 which are threaded into theopenings'30 in said lower member 3, one of said openings30 beingprovided with the .metallic threaded eyelet 29.

31 designates registering channels in the upper and lower members 2 and3 in which is adapted to seat the contact arm 32 which connects oneofthebared ends of the elec trical conductor-27 to the rear end of one ofthe contact clips'34, which aresecured by the screws 25 threaded in thecorresponding opening 38 in the lower housing member 3.

33 designates a corresponding channel in the upper and lowerhousingmembers 2 and 3 in which seats the rear extension 12 of the spring arm11 which is secured at its rear end by one of the binding screws 13threaded in the metallic eyelet 29in one of the holes 30in the lowerhousing member 2. The contact clips 34 seat in the corresponding.registering recesses 36 extending between the bosses 24- and theupturned front edges 37 of the upper and lower housing members 2 and 3,said clips 34 being secured by the screws 25 passing therethrough andthreaded in the opening 38 in the lower housing member 3, as

above set forth- The thermostatic element 16 andthe contact arm 17 seatwithin registering longitudinal recesses 40 in the upper and lowerhousing members 2 and 3, while the periphery of the disc 4 projectsupwardly through the opening 50 in the upper housing member 2,

provided with the knurled or serrated edge 45 for turning or revolvingsaid disc. To prevent the reverse turning of the disc 4, I provide anarm 46 which is superimposed upon the rear portion 12 of the spring arm11 in the channel 33, and the rear end of which is secured by thebinding screw 13 (see Fig. 4), the front end of said arm 46 beingdeflected to form a pawl 46 to engage the roughened edge 45 of the disc4, thus preventing the turning of said disc in reverse direction.

The groove 9 in the disc 4 is provided with the locking notch or recess47, which engages the-lateral extension 10 of the spring arm 11, saidnotch 47 being in registering alignment with the off position of thedevice, thereby preventing the accidental-turning on of the current,which might be the case if the disc 4 -were free to revolve so that thenotch 47 rotary disc 4 in the off serves to lock the position.

The operation is as follows When the disc 4 is in the off position;

and the lateral extension 10 of the spring rzo arm 11 is locked in thenotch 47 of the groove 9 in said disc, the circuit is broken and no heatis developed. When the disc 4 is rotated toward the position markedMedium contact is established between the contact points 14 and 15, andthe circuit is completed. When the device being heated, such as anelectric iron, has developed a certain degree of heat corresponding tothe degree designated medium the thermostatic arm 16 is deflecteddownwardly by the heat generated by electric current and the circuit isbroken by the separation of the contact points 14 and 15.

hen the device has cooled off or fallen to the degree of temperatureless than that indicated medium the thermostatic arm -16 assumes itsnormal upper position and contact is again established. When the deviceis set to hot, it takes a greater degree of heat to deflect thethermostatic arm 16 sufficiently to break the circuit, since due to theeccentricity of the groove 9, the upper contact point 14 is pressed'downa greater distance toward the contact point 15 when the device is set tohot than it is when the device is set to medium, and therefore requiresa greater amount of deflection of the thermostatic arm iltito break thecircuit.

The contact clips may be constructed so as to receive squareor roundpilots, and are in terchangeable. The plu sections or housing arepreferably made of rown bakelite, and

the adjusting disc 4 of red bakelite.

My novel device which can be attached to electric flatirons or any otherheatin appliance using alternating current contro the heat by'adjustingthe revolving disc 4, whose periphery protrudes beyond thesides of the plug housing and as stated is graduated to the number ofdegrees Fahrenheit the operator wishes the heating appliance to retain.

My novel device is interchangeable since it can be put on the applianceeither side up and can be detached instantly and comfortably by reasonof the circular ratchet knurls on the sides of the housing, whichenables the operator firmly to grasp or grip the device to detach itfrom the apphance.

It will be further apparent that when the housing sections seen in Figs.2 and 3 are assembled as seenin Figs. 1 and 5, there is an enlarged heatchamber formed within the recesses 40 and the channels 36 whereby theaction of the thermostatic element is rendered more sensitive andpositive.

I am aware that the invention may be embodied in other specific formswithout departing from the spirit 'or essential attributes thereof, andI therefore desire the present embodiment to be considered in allrespects as illustrative and not restrictive, reference be ing hadto theappended claims rather than to the foregoing description to indicate thescope of the invention. 1

Having thus described my invention what I claim as new and desire tosecure by Letters Patent, is

1. A thermostatic device of the character stated, comprising a housing,contact clips therein, an auxiliary conducting member comprising alongitudinal body portion, and a deflected portion electricallyconnected to the point may be raised and lowered and locked the rotationof said disc.

2. A thermostatic device of the character stated, comprising a housing,contact clips therein, an auxiliary conducting member centrally disposedbetween said clips and having electrical contact with one of said clips,the other of said clips being connected to a source of electricalenergy, a thermostatic arm having one end thereof connected with saidauxiliary contactmember and having its free end provided with an uppercontact point, a rotatable disc having an eccentric groove therein, aspring arm carrying a contact, an extension on the end of said springarm engaging said groove, whereby said spring arm contact point may beraised and lowered, and a pawl for locking said disc from reverserotation. l

3. A. thermostatic device of the character stated, comprising a housing,contact clips therein, an auxiliary conducting member centrally disposedbetween said clips and elec trically connected to one of said clips, theother of said clips being connected to a source of electrical energy, athermostatic member having one end thereof connected with said auxiliarycontact member and having its free end provided with an upper contactpoint, a rotatable disc having an .eccentric groove and a locking recesstherein, a spring arm having one end thereof connected to a source ofelectrical energy and the free end thereof provided with a bottomcontact point juxtaposed to the contact point on the free end of saidthermostaticmember, an extension on said springarm adapted to engagesaid eccentric groove and locking recess, whereby the contact point onsaid ring arm may be raised, lowered, and locke d with respect to thecontact point on said spring arm, and'me'ans for locking said disc fromrotation in a reverse contact clips thereof in contact with saidauxiliary conducting member and the free end thereof provided with acontact point, a rotatable disc having 01f, medium and hot indicia'thereon mounted 1n said houslng and having an eccentricgroove therein, aspring carrying a contact, and an extension on the free end of saidspring arm engaging said groove,v whereby said contact point may beraised and lowered by rotation of said disc, said groove having alocking recess therein, in which ran extension of said contact point isadapted to seat when in its uppermost raised position, said lockingrecess coinciding with the OE indicia of said disc. p a

5. A thermostatic device of the character stated, comprising a housing,contact clips therein, an auxiliary conductor having electricalconnection with one of said clips, a thermostatic member having one endthereof in contact with said auxiliary conductor memher and the free endthereof provided with an .upper contact point, a rotatable disc mountedin and projecting through Said housing and having an eccentric groovewith a locking recess therein, a spring arm having a contact thereonfanextension on the free end of said spring arm engaging said eccentricgroove and locking recess, whereby said spring arm contact point may beraised and lowered by the rotation of said disc, said disc beingprovided with,a rear, graduated peripheral portion containing ofl,medium'and hot indicia, said locking recess coinciding with said oifindicia, and-a lockin pawl engaging the periphery of said disc %ordetermining the position of said spring arm contact point.

SANFORD TAYLOR.

